Merge remote-tracking branch 'remotes/alistair/tags/pull-riscv-to-apply-20210901...

Merge remote-tracking branch 'remotes/alistair/tags/pull-riscv-to-apply-20210901-2' into staging

First RISC-V PR for QEMU 6.2

 - Add a config for Shakti UART
 - Fixup virt flash node
 - Don't override users supplied ISA version
 - Fixup some CSR accesses
 - Use g_strjoinv() for virt machine PLIC string config
 - Fix an overflow in the SiFive CLINT
 - Add 64-bit register access helpers
 - Replace tcg_const_* with direct constant usage

# gpg: Signature made Wed 01 Sep 2021 03:08:48 BST
# gpg:                using RSA key F6C4AC46D4934868D3B8CE8F21E10D29DF977054
# gpg: Good signature from "Alistair Francis <alistair@alistair23.me>" [full]
# Primary key fingerprint: F6C4 AC46 D493 4868 D3B8  CE8F 21E1 0D29 DF97 7054

* remotes/alistair/tags/pull-riscv-to-apply-20210901-2: (33 commits)
  target/riscv: Use {get,dest}_gpr for RVV
  target/riscv: Tidy trans_rvh.c.inc
  target/riscv: Use {get,dest}_gpr for RVD
  target/riscv: Use {get,dest}_gpr for RVF
  target/riscv: Use gen_shift_imm_fn for slli_uw
  target/riscv: Use {get,dest}_gpr for RVA
  target/riscv: Reorg csr instructions
  target/riscv: Fix hgeie, hgeip
  target/riscv: Fix rmw_sip, rmw_vsip, rmw_hsip vs write-only operation
  target/riscv: Use {get, dest}_gpr for integer load/store
  target/riscv: Use get_gpr in branches
  target/riscv: Use extracts for sraiw and srliw
  target/riscv: Use DisasExtend in shift operations
  target/riscv: Add DisasExtend to gen_unary
  target/riscv: Move gen_* helpers for RVB
  target/riscv: Move gen_* helpers for RVM
  target/riscv: Use gen_arith for mulh and mulhu
  target/riscv: Remove gen_arith_div*
  target/riscv: Add DisasExtend to gen_arith*
  target/riscv: Introduce DisasExtend and new helpers
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>